CN108011672A - The detection device and method that compatible polarization demodulation number of photons is differentiated in laser communication - Google Patents
The detection device and method that compatible polarization demodulation number of photons is differentiated in laser communication Download PDFInfo
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- CN108011672A CN108011672A CN201711275324.6A CN201711275324A CN108011672A CN 108011672 A CN108011672 A CN 108011672A CN 201711275324 A CN201711275324 A CN 201711275324A CN 108011672 A CN108011672 A CN 108011672A
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- 230000010287 polarization Effects 0.000 title claims abstract description 28
- 238000004891 communication Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 5
- 239000013307 optical fiber Substances 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 4
- 210000001367 artery Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 102000054766 genetic haplotypes Human genes 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
- H04B10/6151—Arrangements affecting the optical part of the receiver comprising a polarization controller at the receiver's input stage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/614—Coherent receivers comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/06—Polarisation multiplex systems
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Abstract
The invention discloses the detection device and method that compatible polarization demodulation number of photons is differentiated in a kind of laser communication.The device includes half-wave plate, polarization beam apparatus, fiber coupler, fiber optic splitter, single-photon detector etc., composite polarizing light through Polarization Modulation is divided into the mutually orthogonal linearly polarized light of two beams by half-wave plate and polarization beam apparatus, it is divided into multiple passages by fiber coupler coupled into optical fibres and by beam splitting afterwards, finally each passage is detected using single-photon detector, pulsed light subnumber which arrives is calculated according to the result of detection of each passage.The invention has the advantages of structure is convenient, cost is low, expansible in photon counting laser communication.
Description
Technical field
The present invention relates to the reception detection in laser communication, and in particular to demodulation light is polarized in photon counting laser communication
Subnumber resolving method.
Background technology：
Conventional laser communication at present belongs to strong optic communication system, and Laser Modulation mode, which can be divided into directly modulation or be concerned with, to be adjusted
System.Strong light reactance modulation system is both needed to increase considerably with the volume power consumption of communication distance increase communication terminal；And coherent modulation
Mode then system complex, is had a great influence, there are destabilizing factor by environment, optical link.In deep space and underwater lossy is waited to believe
Conventional strong optic communication system is not suitable in road, need to use photon counting laser communication system.Photon counting laser communication belongs to
Dim light communication mode, the coding light laser of exit end is after the decay of super remote channel, in the only remaining single photon magnitude of receiving terminal
Energy, is detected by single-photon detector and is decoded.
Core technology is that the effective of single photon signal is detected in photon counting laser communication, photon counting laser communication
In it is more sensitive to background noise, in order to effectively suppress ambient noise influence, it is necessary to can differentiate reception optical signal pulses in
Photon number, so as to carry out the examination of effective optical signal.Polarization modulation method is used at the same time, can further reduce background shadow
Ring, and improve traffic rate.
Haplotype Geiger mode angular position digitizer single-photon detector performance is good at present, technology maturation, but does not possess photon resolution capability, and
Possess photon resolution capability face formation single-photon detector then obtain it is difficult, with high costs.
The content of the invention：
In order to solve the problems, such as present in background technology, the present invention proposes a kind of for simultaneous in photon counting laser communication
Hold the detection device that polarization demodulation is differentiated with number of photons, have the advantages that structure is convenient, cost is low, expansible.
The test device of the present invention as shown in Figure 1, including half-wave plate 1, polarization beam apparatus 2, fiber coupler 3, optical fiber
Beam splitter 4, single-photon detector 5, receiving telescope 6.The composite polarizing light that receiving telescope 6 receives is adjusted by half-wave plate 1
Its polarization direction, makes its polarization direction consistent with the direction of polarization beam apparatus 2 afterwards, and polarization beam apparatus 2 is by composite polarizing light
It is divided into the orthogonal linearly polarized light of two-way；Afterwards by two fiber couplers 3 by the orthogonal linearly polarized light coupled into optical fibres of this two-way
It is interior, to each route polarised light, the light beam in optical fiber is divided into 4-8 passage, the light of each passage using fiber optic splitter 4
Signal is finally received by the single-photon detector 5 for being connected to each passage.
Number of photons resolving method step is as follows：
1. using the rising edge time of each single-photon detector output electric signal as basis for estimation；
2. using the electric signal moment of first output as original bench mark, the interior all spies occurred of time interval Δ t behind
The signal pulse number of photons that the total number of device signal is reached as this moment is surveyed, the size of Δ t is by flashlight arteries and veins in communication system
Rush width and channel expansion amount concrete decision；
3. more than the signal that the detector signal that the Δ t times occur is considered as the next moment.
The present invention has the advantages that：
1. being modulated using palarization multiplexing, and polarization demodulation is carried out in receiving terminal, the transmission that can significantly improve communication system is held
Amount；
2. optical signal will be received to be divided into multiple signals and detected using single-photon detector respectively, possesses number of photons point
The ability distinguished, can test out the number of photons in light pulse signal, can effectively suppress ambient noise.
Brief description of the drawings：
Fig. 1 is detection system schematic diagram.1. half-wave plates, 2. polarization beam apparatus, 3. fiber couplers, 4. optical fiber point in figure
Beam device, 5. single-photon detectors, 6. receiving telescopes.
Fig. 2 is the number of photons resolving method schematic diagram based on multi-channel single photon detector.
Embodiment：
As shown in Figure 1, the parameter respectively formed is described as test device and connection：
1) half-wave plate：1/2 inch of bore, uses wavelength 780nm；
2) polarization beam apparatus：1/2 inch of polarization beam splitting cube, splitting ratio 1:1；
3) fiber coupler：F=4.51mm, NA=0.57, use wavelength 780nm；
4) fiber optic splitter：1 × 2 single-mode optical-fibre coupler, splitting ratio 1:1；
5) single-photon detector：Silicon substrate single-photon detector, model EXCELITAS companies production SPCM-AQRH-16-
FC；
6) receiving telescope：Bore 100mm, compresses 10 times of multiplying power.
Specific implementation step is：
1) signal that will transmit in transmitting terminal is encoded to be loaded on laser with modulation, produces the light arteries and veins of Polarization Modulation
Rush signal；
2) receiving terminal adjusts the polarization direction of incident light using half-wave plate 1, by polarization basic vector alignment.Pass through polarization beam splitting again
Device 2 separates the polarised light of two orthogonal directions, and by fiber coupler 3 by the polarised light coupled into optical fibres after separation；
The polarised light in optical fiber is divided into 4 road signals using fiber optic splitter 4, and is detected by single-photon detector 5
Output per road signal, as a result as shown in Figure 2, the pulse of passage 3 reaches at first, behind time interval Δ t=1ns it
Interior, passage 1 and passage 2 also have received pulse signal, and the time that the pulse signal of passage 4 reaches is later than 1ns, therefore can be with
Think in the reception to 3 photons, i.e., the photon that passage 1, passage 2 and passage 3 receive.And the pulse of passage 4 is recognized
To be the signal pulse at next moment.
Claims (2)
1. the detection device that compatible polarization demodulation number of photons is differentiated in a kind of laser communication, including half-wave plate (1), polarization beam splitting
Device (2), fiber coupler (3), fiber optic splitter (4), single-photon detector (5), receiving telescope (6), it is characterised in that：
The composite polarizing light received by receiving telescope (6) adjusts its polarization direction by rotatable halfwave plate (1), makes its polarization side
To consistent with the direction of polarization beam apparatus (2), composite polarizing light is divided into the orthogonal linearly polarized light of two-way by polarization beam apparatus (2),
, to each route polarised light, made in the orthogonal linearly polarized light coupled into optical fibres of this two-way by two fiber couplers (3) afterwards
The light beam in optical fiber is divided into 4-8 passage with fiber optic splitter (4), the optical signal of each passage is finally each logical by being connected to
The single-photon detector (5) in road receives.
2. the number of photons point for the detection device that a kind of a kind of compatible Polarization Modulation and number of photons based on described in claim 1 are differentiated
Distinguish method, it is characterised in that include the following steps：
1) using the rising edge time of each single-photon detector output electric signal as basis for estimation；
2) using the electric signal moment of first output as original bench mark, all detectors for occurring behind in time interval Δ t
The signal pulse number of photons that the total number of signal is reached as this moment, the size of Δ t are wide by signal pulse in communication system
Degree and channel expansion amount concrete decision；
3) detector signal occurred more than the Δ t times is considered as the signal at next moment.
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| CN201711275324.6A CN108011672A (en) | 2017-12-06 | 2017-12-06 | The detection device and method that compatible polarization demodulation number of photons is differentiated in laser communication |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946710A (en) * | 2019-03-29 | 2019-06-28 | 中国科学院上海技术物理研究所 | A kind of more polarized laser imaging devices of dual wavelength |
| CN111290089A (en) * | 2020-04-14 | 2020-06-16 | 东莞铭普光磁股份有限公司 | Multi-wavelength coupling light emitting device |
| WO2022048254A1 (en) * | 2020-09-03 | 2022-03-10 | 五邑大学 | Multi-area ranging method and system based on chaotic polarization radar |
| CN117367578A (en) * | 2023-12-08 | 2024-01-09 | 合肥硅臻芯片技术有限公司 | Photon number resolution detector and detection method thereof |
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| CN102607721A (en) * | 2012-04-06 | 2012-07-25 | 山西大学 | Measurement method for distinguishing quantity of photons through single photon detector |
| CN106789048A (en) * | 2017-03-08 | 2017-05-31 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system and method based on two-way single photon detection |
| CN207530835U (en) * | 2017-12-06 | 2018-06-22 | 中国科学院上海技术物理研究所 | The detection device that compatible polarization demodulation number of photons is differentiated in laser communication |
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2017
- 2017-12-06 CN CN201711275324.6A patent/CN108011672A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| US20100208334A1 (en) * | 2009-02-17 | 2010-08-19 | Nucrypt, Inc. | System and method for entangled photons generation and measurement |
| CN102607721A (en) * | 2012-04-06 | 2012-07-25 | 山西大学 | Measurement method for distinguishing quantity of photons through single photon detector |
| CN106789048A (en) * | 2017-03-08 | 2017-05-31 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system and method based on two-way single photon detection |
| CN207530835U (en) * | 2017-12-06 | 2018-06-22 | 中国科学院上海技术物理研究所 | The detection device that compatible polarization demodulation number of photons is differentiated in laser communication |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946710A (en) * | 2019-03-29 | 2019-06-28 | 中国科学院上海技术物理研究所 | A kind of more polarized laser imaging devices of dual wavelength |
| CN109946710B (en) * | 2019-03-29 | 2023-12-26 | 中国科学院上海技术物理研究所 | Dual-wavelength multi-polarization laser imaging device |
| CN111290089A (en) * | 2020-04-14 | 2020-06-16 | 东莞铭普光磁股份有限公司 | Multi-wavelength coupling light emitting device |
| WO2022048254A1 (en) * | 2020-09-03 | 2022-03-10 | 五邑大学 | Multi-area ranging method and system based on chaotic polarization radar |
| CN117367578A (en) * | 2023-12-08 | 2024-01-09 | 合肥硅臻芯片技术有限公司 | Photon number resolution detector and detection method thereof |
| CN117367578B (en) * | 2023-12-08 | 2024-02-23 | 合肥硅臻芯片技术有限公司 | Photon number resolution detector and detection method thereof |
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